Adjust the oven rack to the lower third position and preheat the oven to 350 degrees F. Lightly coat a 8x4-inch loaf pan with nonstick spray. Set aside.
In a separate bowl, whisk together the Greek yogurt, honey, melted butter, vanilla, and lemon zest until smoothly combined. Whisk in the eggs. If the butter resolidifies, gently warm the bowl in the microwave, just until it melts again.
Add the wet ingredients to the dry ingredients, and with a wooden spoon or spatula, very gently stir the batter, stopping as soon as the flour disappears. Fold in the blueberries.
For the topping, if using: In a small bowl, stir together the raw sugar and cinnamon.
Spoon the batter into the prepared baking pan and smooth the top. Sprinkle with the cinnamon-sugar topping, if using. Bake for 30 minutes, then loosely tent the pan with foil to keep the bread from browning too quickly. Continue baking for 15 to 20 additional minutes (45 to 50 minutes total), or until a toothpick inserted in the center of the loaf comes out clean without any wet batter clinging to it. Place the pan on a wire rack and let cool completely. Transfer to a cutting board, slice, and enjoy!
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